/*! ******************************************************************************
 *
 * Pentaho Data Integration
 *
 * Copyright (C) 2002-2017 by Hitachi Vantara : http://www.pentaho.com
 *
 *******************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ******************************************************************************/

package org.pentaho.di.trans.dataservice.testing.answers;

import org.mockito.Mockito;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

import java.lang.reflect.Method;

/**
 * @author nhudak
 */
public class ReturnsSelf implements Answer<Object> {
  public static final ReturnsSelf RETURNS_SELF = new ReturnsSelf();
  private final Answer<Object> defaultAnswer;

  public ReturnsSelf() {
    this( Mockito.RETURNS_DEFAULTS );
  }

  public ReturnsSelf( Answer<Object> defaultAnswer ) {
    this.defaultAnswer = defaultAnswer;
  }

  @Override public Object answer( InvocationOnMock invocation ) throws Throwable {
    Method method = invocation.getMethod();
    if ( method.getReturnType().isInstance( invocation.getMock() ) ) {
      return invocation.getMock();
    } else {
      return defaultAnswer.answer( invocation );
    }
  }
}
